Abstract: Multi layered mixed forests with different ages are one of the main goals of sustainable forest management. Studying its construction measures is of great significance for optimizing forest structure and improving forest quality. This article summarizes the current status of technology in multi-layered mixed forests with different ages, analyzes the problems in managing such forests through transformation, and proposes a construction method that combines artificial afforestation with natural regeneration. Specific measures are discussed from the aspects of planting mode, tree species configuration, construction area, and construction direction, providing technical support for optimizing the structure of artificial forests, near natural transformation, and nurturing management. Research has shown that mixed tree species and the continuous existence of renewal layers are direct factors in the formation of multi-layered mixed forests with different ages. In the initial stage of afforestation, adopting a block mixed planting mode can avoid planting all the afforestation land at once, and reserve the empty space for natural renewal to fill, which is conducive to the formation of mixed forests and more in line with natural laws. Adopting the method of staged afforestation and using seedlings of different ages to form a multi-level tree height distribution in the vertical structure, in order to form a multi-layered heterogeneous forest. When creating artificial forests, attention should be paid to relying on natural forces for vegetation restoration and natural restoration, and a combination of artificial afforestation and natural restoration methods should be adopted. But it is necessary to scientifically assess the threshold for degraded ecological restoration, quantify the necessary human intervention and the degree of reliance on natural restoration.